JTable save on exit. And load on start-up

I've looked at many many examples of saving JTable but i'm not getting closer to finishing my project.

I am using DefaultTableModel and JTable. When i open the program everything works and i can add a row, remove a row and such, but I need to save the values inside the JTable at close and open them again when i open the program again.

I've not specified any ArrayList or Vector but it is my understanding that DefaultTableModel saves the inserted rows in Vector.  I will attach all my code so you can maybe find out what is wrong.... I tried inserting fireTableDataChanged, and setValueAt, but maybe i waas doing it wrong

Thank You
kv Jón Orri Sigurðarson

import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import java.net.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.table.*;
import javax.swing.text.*;

public class jozioforrit extends JPanel {
	
	class AboutDialog extends JDialog {
		/**
		 * 
		 */
		private static final long serialVersionUID = 1L;

		public AboutDialog(JFrame parent) {
			setMaximumSize(new Dimension(250,150));
			Box b = Box.createVerticalBox();
			try {
				Object columnrow = table.getModel().getValueAt(table.getSelectedRow(),0);
				String banan = columnrow.toString();
				String banani = banan.replace(' ', '+');
				URL url = new URL("http://en.wikiwix.com/export/export.php?backend=html&url=http://en.wikipedia.org/wiki/" + banani);
				String banana = url.toString();
				System.out.println(banana);
				JEditorPane pppane = new JEditorPane();
				pppane.setPage(url);
				JScrollPane skroll = new JScrollPane(pppane);
				b.add(skroll);
			} catch (MalformedURLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			getContentPane().add(b, "Center");
			setSize(750, 500);
			setLocation(400,70);
		}
	}

	public class ButtonColumn extends AbstractCellEditor implements
			TableCellRenderer, TableCellEditor, ActionListener, MouseListener {
		/**
		 * 
		 */
		private static final long serialVersionUID = 1L;
		private Action action;
		private JButton editButton;
		private Border focusBorder;
		private boolean isButtonColumnEditor;
		private int mnemonic;

		private Border originalBorder;
		private JButton renderButton;
		private JTable table;
		private String text;

		/**
		 * Create the ButtonColumn to be used as a renderer and editor. The
		 * renderer and editor will automatically be installed on the
		 * TableColumn of the specified column.
		 * 
		 * @param table
		 *            the table containing the button renderer/editor
		 * @param action
		 *            the Action to be invoked when the button is invoked
		 * @param column
		 *            the column to which the button renderer/editor is added
		 */
		public ButtonColumn(JTable table, Action action, int column) {
			this.table = table;
			this.action = action;

			renderButton = new JButton();
			editButton = new JButton();
			editButton.setFocusPainted(false);
			editButton.addActionListener(this);
			originalBorder = editButton.getBorder();
			setFocusBorder(new LineBorder(Color.BLUE));

			TableColumnModel columnModel = table.getColumnModel();
			columnModel.getColumn(column).setCellRenderer(this);
			columnModel.getColumn(column).setCellEditor(this);
			table.addMouseListener(this);
		}

		//
		// Implement ActionListener interface
		//
		/*
		 * The button has been pressed. Stop editing and invoke the custom
		 * Action
		 */
		public void actionPerformed(ActionEvent e) {
			int row = table.convertRowIndexToModel(table.getEditingRow());
			fireEditingStopped();

			// Invoke the Action

			ActionEvent event = new ActionEvent(table,
					ActionEvent.ACTION_PERFORMED, "" + row);
			action.actionPerformed(event);
		}

		@Override
		public Object getCellEditorValue() {
			return text;
		}

		/**
		 * Get foreground color of the button when the cell has focus
		 * 
		 * @return the foreground color
		 */
		public Border getFocusBorder() {
			return focusBorder;
		}

		public int getMnemonic() {
			return mnemonic;
		}

		@Override
		public Component getTableCellEditorComponent(JTable table,
				Object value, boolean isSelected, int row, int column) {
			text = (value == null) ? "Wiki" : value.toString();
			editButton.setText(text);
			return editButton;
		}

		//
		// Implement TableCellRenderer interface
		//
		public Component getTableCellRendererComponent(JTable table,
				Object value, boolean isSelected, boolean hasFocus, int row,
				int column) {
			if (isSelected) {
				renderButton.setForeground(table.getSelectionForeground());
				renderButton.setBackground(table.getSelectionBackground());
			} else {
				renderButton.setForeground(table.getForeground());
				renderButton.setBackground(UIManager
						.getColor("Button.background"));
			}

			if (hasFocus) {
				renderButton.setBorder(focusBorder);
			} else {
				renderButton.setBorder(originalBorder);
			}

			renderButton.setText((value == null) ? "Wiki" : value.toString());
			return renderButton;
		}

		public void mouseClicked(MouseEvent e) {
		}

		public void mouseEntered(MouseEvent e) {
		}

		public void mouseExited(MouseEvent e) {
		}

		//
		// Implement MouseListener interface
		//
		/*
		 * When the mouse is pressed the editor is invoked. If you then then
		 * drag the mouse to another cell before releasing it, the editor is
		 * still active. Make sure editing is stopped when the mouse is
		 * released.
		 */
		public void mousePressed(MouseEvent e) {
			if (table.isEditing() && table.getCellEditor() == this)
				isButtonColumnEditor = true;
		}

		public void mouseReleased(MouseEvent e) {
			if (isButtonColumnEditor && table.isEditing())
				table.getCellEditor().stopCellEditing();

			isButtonColumnEditor = false;
		}

		/**
		 * The foreground color of the button when the cell has focus
		 * 
		 * @param focusBorder
		 *            the foreground color
		 */
		public void setFocusBorder(Border focusBorder) {
			this.focusBorder = focusBorder;
			editButton.setBorder(focusBorder);
		}

		/**
		 * The mnemonic to activate the button when the cell has focus
		 * 
		 * @param mnemonic
		 *            the mnemonic
		 */
		public void setMnemonic(int mnemonic) {
			this.mnemonic = mnemonic;
			renderButton.setMnemonic(mnemonic);
			editButton.setMnemonic(mnemonic);
		}
	}

	private static void createAndShowGUI() {
		JMenuBar menuBar;
		JMenu menu;
		JMenuItem menuItem;
		menuBar = new JMenuBar();
		menu = new JMenu("File");
		menu.setMnemonic(KeyEvent.VK_F);
		menu.getAccessibleContext().setAccessibleDescription(
				"The only menu in this program that has menu items");
		menuBar.add(menu);
		menuItem = new JMenuItem("A text-only menu item", KeyEvent.VK_T);
		menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_1,
				ActionEvent.ALT_MASK));
		menuItem.getAccessibleContext().setAccessibleDescription(
				"This doesn't really do anything");
		menu.add(menuItem);
		menuBar.add(menu);
		// Create and set up the window.
		
		JFrame frame = new JFrame("Tölvuleikjaskipuleggjari jos16");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		// Create and set up the content pane.
		jozioforrit newContentPane = new jozioforrit();
		newContentPane.setOpaque(true); // content panes must be opaque
		frame.setContentPane(newContentPane);

		// Display the window.
		frame.setJMenuBar(menuBar);
		frame.setLocation(20,20);
		frame.setMinimumSize(new Dimension(480,150));
		frame.pack();
		frame.setVisible(true);
	}

	public static void main(String[] args) {
		createAndShowGUI();
	}

	private JTextField filterText;

	private TableRowSorter<TableModel> sorter;

	private JTable table;

	public jozioforrit() {
		Object rows[][] = {
				{ "Leikurinn", "Veldu tegund úr listanum", "Einkunn", "Bannað?" },
				{ "Prince of Persia", "", "", "" } };
		String columns[] = { "Leikur", "Tegund Leiks", "Einkunn",
				"Aldurshópur", "Um Leikinn"};

		setLayout(new GridBagLayout());
		GridBagConstraints c = new GridBagConstraints();

		// Create a table with a sorter.
		final DefaultTableModel model = new DefaultTableModel(rows, columns) {
			@Override
			public Class getColumnClass(int column) {
				Class returnValue;
				if ((column >= 0) && (column < getColumnCount())) {
					returnValue = getValueAt(0, column).getClass();
				} else {
					returnValue = Object.class;
				}
				return returnValue;
			}
		};
		sorter = new TableRowSorter<TableModel>(model);
		table = new JTable(model);

		table.setRowHeight(20);
		table.setFont(new Font("Calibri", Font.PLAIN, 13));
		
		table.getColumnModel().getColumn(0).setMinWidth(105);
		table.getColumnModel().getColumn(1).setMinWidth(165);
		table.getColumnModel().getColumn(2).setMinWidth(60);
		table.getColumnModel().getColumn(3).setMinWidth(70);
		table.getColumnModel().getColumn(4).setMinWidth(80);
		
		TableColumn tableColumn = table.getColumnModel().getColumn(1);
		JComboBox comboBox = new JComboBox();
		comboBox.addItem("Hlutverkaleikur");
		comboBox.addItem("Íþróttir");
		comboBox.addItem("Borðspil");
		comboBox.addItem("Fyrstu persónu skotleikur");
		comboBox.addItem("Barnaleikur");
		comboBox.addItem("Ævintýri");
		comboBox.addItem("Herkænskuleikur");
		comboBox.addItem("Púsl og/eða smáleikur");
		comboBox.setEditable(true);
		tableColumn.setCellEditor(new DefaultCellEditor(comboBox));

		TableColumn tableColumn2 = table.getColumnModel().getColumn(2);
		JComboBox comboBox2 = new JComboBox();
		comboBox2.addItem("10");
		comboBox2.addItem("9");
		comboBox2.addItem("8");
		comboBox2.addItem("7");
		comboBox2.addItem("6");
		comboBox2.addItem("5");
		comboBox2.addItem("4");
		comboBox2.addItem("3");
		comboBox2.addItem("2");
		comboBox2.addItem("1");
		comboBox2.setEditable(false);
		tableColumn2.setCellEditor(new DefaultCellEditor(comboBox2));

		TableColumn tableColumn3 = table.getColumnModel().getColumn(3);
		JComboBox comboBox3 = new JComboBox();
		comboBox3.addItem("Leyfilegt öllum");
		comboBox3.addItem("6+");
		comboBox3.addItem("12+");
		comboBox3.addItem("16+");
		comboBox3.addItem("18+");
		comboBox3.setEditable(true);
		tableColumn3.setCellEditor(new DefaultCellEditor(comboBox3));

		JButton button = new JButton("Skrá leik");
		button.setPreferredSize(new Dimension(85, 20));
		button.setBorder(BorderFactory.createEtchedBorder());
		button.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				Object[] kuki = new Object[] {"Nýr Leikur", "Tegund"};
				model.insertRow(1,kuki);
			}
		});

		add(button, c);

		table.setRowSorter(sorter);
		table.setPreferredScrollableViewportSize(new Dimension(500, 210));
		table.setFillsViewportHeight(true);
		// single selection
		table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

		Action meira = new AbstractAction() {
			/**
			 * 
			 */
			private static final long serialVersionUID = 1L;

			@SuppressWarnings("deprecation")
			public void actionPerformed(ActionEvent e) {
				e.getSource();
				Integer.valueOf(e.getActionCommand());

				JDialog f = new AboutDialog(new JFrame());
				f.show();
			}
		};

		ButtonColumn buttonColumn = new ButtonColumn(table, meira, 4);
		buttonColumn.setMnemonic(KeyEvent.VK_W);
		
		JScrollPane scrollPane = new JScrollPane(table);
		c.anchor = GridBagConstraints.NORTH;
		c.fill = GridBagConstraints.BOTH;
		c.weightx = 1.0;
		c.weighty = 1.0;
		c.gridwidth = 3;
		c.gridx = 0;
		c.gridy = 1;
		add(scrollPane, c);

		JLabel l1 = new JLabel("Leita");
		c.anchor = GridBagConstraints.NORTH;
		c.fill = GridBagConstraints.HORIZONTAL;
		c.weighty = 0.0;
		c.gridheight = 1;
		c.gridx = 1;
		c.gridy = 0;
		c.insets = new Insets(0, 100, 0, 0);
		add(l1, c);
		filterText = new JTextField();
		// Whenever filterText changes, invoke newFilter.
		filterText.getDocument().addDocumentListener(new DocumentListener() {
			public void changedUpdate(DocumentEvent e) {
				if (filterText.getText().length() == 0) {
					sorter.setRowFilter(null);
				} else {
					sorter.setRowFilter(RowFilter.regexFilter(filterText
							.getText()));
				}
			}

			public void insertUpdate(DocumentEvent e) {
				if (filterText.getText().length() == 0) {
					sorter.setRowFilter(null);
				} else {
					sorter.setRowFilter(RowFilter.regexFilter(filterText
							.getText()));
				}
			}

			public void removeUpdate(DocumentEvent e) {
				if (filterText.getText().length() == 0) {
					sorter.setRowFilter(null);
				} else {
					sorter.setRowFilter(RowFilter.regexFilter(filterText
							.getText()));
				}
			}
		});
		l1.setLabelFor(filterText);
		c.anchor = GridBagConstraints.NORTH;
		c.fill = GridBagConstraints.HORIZONTAL;
		c.weighty = 0.0;
		c.gridheight = 1;
		c.gridx = 2;
		c.gridy = 0;
		c.insets = new Insets(0, 140, 0, 0);
		add(filterText, c);

	}

}

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